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Derivative Financial Instruments (Narrative) (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 06, 2009 | Dec. 31, 2013 | Aug. 10, 2014 | Dec. 31, 2014 | Aug. 09, 2013 | Feb. 13, 2014 | Feb. 13, 2015
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |
Secured loan |  | 20,000,000 us-gaap_SecuredDebt |  | $ 20,000,000 us-gaap_SecuredDebt |  |  |
AFL [Member] |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  | 144,000,000 invest_DerivativeNotionalAmount / dei_LegalEntityAxis = mcy_AFLMember |  |  |
FFL [Member] |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |
Notional amount |  |  |  | 114,000,000 invest_DerivativeNotionalAmount / dei_LegalEntityAxis = mcy_FFLMember |  |  |
Interest Rate Swap [Member] | Credit Facility [Member] |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |
Secured loan | 120,000,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = mcy_CreditFacilityMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember |  |  |  |  |  |
Fixed rate | 1.93%us-gaap_DerivativeFixedInterestRate / us-gaap_DebtInstrumentAxis = mcy_CreditFacilityMember / us-gaap_FinancialInstrumentAxis = us-gaap_InterestRateSwapMember |  |  |  |  |  |
Maturity date of senior notes | January 3, 2012 |  |  |  |  |  |
Swap [Member] | AFL [Member] |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |
Term of swap agreement |  | 3 years |  |  |  |  |
Notional amount |  |  |  | 144,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / dei_LegalEntityAxis = mcy_AFLMember |  |  |
Swap agreement collateral |  |  |  | 40,000,000 us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / dei_LegalEntityAxis = mcy_AFLMember |  |  |
Swap [Member] | FFL [Member] |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |
Term of swap agreement |  |  | 3 years |  |  |  |
Notional amount |  |  |  | 114,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / dei_LegalEntityAxis = mcy_FFLMember |  |  |
Swap agreement collateral |  |  |  | $ 30,000,000 us-gaap_DerivativeCollateralRightToReclaimSecurities / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / dei_LegalEntityAxis = mcy_FFLMember |  |  |
LIBOR [Member] | Swap [Member] | AFL [Member] |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.20%us-gaap_DerivativeBasisSpreadOnVariableRate / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / dei_LegalEntityAxis = mcy_AFLMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |
LIBOR [Member] | Swap [Member] | FFL [Member] |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.40%us-gaap_DerivativeBasisSpreadOnVariableRate / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / dei_LegalEntityAxis = mcy_FFLMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Scenario, Forecast [Member] | LIBOR [Member] | Swap [Member] | FFL [Member] |  |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 1.35%us-gaap_DerivativeBasisSpreadOnVariableRate / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / dei_LegalEntityAxis = mcy_FFLMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeCollateralRightToReclaimSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_SecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | dei_LegalEntityAxis=mcy_FFLMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeByNatureAxis=us-gaap_SwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |